The tests would see Australian Federal Police, Crime Commission and Customs officers set up with temptations to take bribes, money or valuable items.

The Northern Territory Police Association acting president David Chalker said the tests would be 'unethical' and 'offensive'.

"Certainly, there are temptations throughout the working day, and just personally, I've been in the police force for 33 years and...there's money when doing searches...but there's no thought of that every going in anybody's pockets," he said.

"I've never had one bribe offered to me, and I can speak on behalf of other officers out there, they would never accept them, they would be offended."

He said the Government's proposal shows distrust in public servants, without evidence to suggest Northern Territory police officers are corrupt.

"We would oppose anything like (the tests)," Mr Chalker said.

Northern Territory Public Sector Union president Kay Densley said the anti-corruption plan was 'overboard' and could invade the privacy of public servants.

"Ninety-nine point nine per cent of people do the right thing, and this just seems a bit over the top," Ms Densley said.

"It's not naive to suggest (public servants are immune to temptations). People join the public service for a reason and that's to do a good job.

"They take their role very seriously and they're very proud of the work they do. It's often demanding work and it's often very dangerous.

"For the small few they are talking about, I think they are going overboard with what they're planning to do."

Ms Densley said the anti-corruption measures had the potential to undermine mateship and create a climate of fear.

The legislation will not be introduced to Parliament until after June this year.